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      <a href="/2016/09/10/vue-notes-3-create-header/" title="Vue使用笔记3--创建头部组件" itemprop="url">Vue使用笔记3--创建头部组件</a>
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    <time datetime="2016-09-09T20:31:34.000Z" itemprop="datePublished">2016-09-10</time>
    更新日期:<time datetime="2018-12-18T15:40:28.103Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Vue组件"><span class="toc-number">1.</span> <span class="toc-text">Vue组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Vue实例"><span class="toc-number">1.1.</span> <span class="toc-text">Vue实例</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实例生命周期"><span class="toc-number">1.2.</span> <span class="toc-text">实例生命周期</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Vue组件-1"><span class="toc-number">1.3.</span> <span class="toc-text">Vue组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#父子组件通信"><span class="toc-number">1.4.</span> <span class="toc-text">父子组件通信</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">1.5.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#创建头部菜单"><span class="toc-number">2.</span> <span class="toc-text">创建头部菜单</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#添加头部组件"><span class="toc-number">2.1.</span> <span class="toc-text">添加头部组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加属性Props"><span class="toc-number">2.2.</span> <span class="toc-text">添加属性Props</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加state状态"><span class="toc-number">2.3.</span> <span class="toc-text">添加state状态</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#setInterval时钟"><span class="toc-number">2.4.</span> <span class="toc-text">setInterval时钟</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#设置render模板"><span class="toc-number">2.5.</span> <span class="toc-text">设置render模板</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Index组件中添加Header"><span class="toc-number">2.6.</span> <span class="toc-text">Index组件中添加Header</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近在学习使用Vue作为前端的框架，《Vue使用笔记》系列用于记录过程中的一些使用和解决方法。<br>本文记录Vue组件相关，以及创建头部组件的过程。<br><a id="more"></a></p>
<p>实话说，在使用过angular以及react之后，vue给本骚年的感觉就是两者的优点结合在一起了呢。</p>
<h2 id="Vue组件"><a href="#Vue组件" class="headerlink" title="Vue组件"></a>Vue组件</h2><hr>
<h3 id="Vue实例"><a href="#Vue实例" class="headerlink" title="Vue实例"></a>Vue实例</h3><ul>
<li>一个Vue实例其实正是一个MVVM模式中所描述的ViewModel</li>
<li>在实例化Vue时，需要传入一个选项对象，它可以包含数据、模板、挂载元素、方法、生命周期钩子等选项，<a href="http://cn.vuejs.org/api/" target="_blank" rel="external">参考</a></li>
<li>可以扩展Vue构造器，从而用预定义选项创建可复用的组件构造器</li>
</ul>
<h3 id="实例生命周期"><a href="#实例生命周期" class="headerlink" title="实例生命周期"></a>实例生命周期</h3><p>这里简单放个图吧，左侧的红色框框代表具体的生命周期钩子。<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/lifecycle.png" alt="image"><br><a href="http://cn.vuejs.org/api/#选项-生命周期钩子" target="_blank" rel="external">官方文档</a>里面有详细的生命周期钩子哦，大家有需要的话可以具体去研究一下。</p>
<h3 id="Vue组件-1"><a href="#Vue组件-1" class="headerlink" title="Vue组件"></a>Vue组件</h3><p>组件可以扩展HTML元素，封装可重用的代码。在较高层面上，组件是自定义元素，Vue.js的编译器为它添加特殊功能。</p>
<ul>
<li>所有的Vue.js组件其实都是被扩展的Vue实例</li>
<li>Vue 的模板是DOM模板，使用浏览器原生的解析器（React则是自己实现一个）</li>
<li>Props属性<ul>
<li>组件实例的作用域是孤立的。可以使用props把数据传给子组件，也可以用v-bind绑定动态Props到父组件的数据</li>
<li>prop默认是单向绑定，使用.sync或.once绑定修饰符显式地强制双向或单次绑定</li>
<li>组件可以为 props 指定验证要求（类似React的proptype吧）</li>
</ul>
</li>
<li>动态组件<ul>
<li>多个组件可以使用同一个挂载点，动态地绑定到它的is特性，在它们之间切换</li>
<li>keep-alive可以把切换出去的组件保留在内存中，保留它的状态或避免重新渲染</li>
<li>在切换组件时，切入组件在切入前可能需要进行一些异步操作。使用activate钩子控制组件切换时长</li>
<li>transition-mode特性用于指定两个动态组件之间如何过渡</li>
<li>组件当它有name选项时，可以在它的模板内可以递归地调用自己</li>
</ul>
</li>
</ul>
<h3 id="父子组件通信"><a href="#父子组件通信" class="headerlink" title="父子组件通信"></a>父子组件通信</h3><ul>
<li><p>使用父链（会使得父组件与子组件紧密地耦合）</p>
<ul>
<li>子组件可以用this.$parent访问它的父组件</li>
<li>根实例的后代可以用this.$root访问它</li>
<li>父组件有一个数组this.$children，包含它所有的子元素</li>
</ul>
</li>
<li><p>自定义事件（Vue事件在冒泡过程中第一次触发回调之后自动停止冒泡，调用true取消）</p>
<ul>
<li>使用$on()监听事件</li>
<li>使用$emit()在它上面触发事件</li>
<li>使用$dispatch()派发事件，事件沿着父链冒泡</li>
<li>使用$broadcast()广播事件，事件向下传导给所有的后代</li>
</ul>
</li>
<li><p>子组件索引</p>
<ul>
<li>使用v-ref为子组件指定一个索引ID（类似于React的ref属性）</li>
</ul>
</li>
<li><p>使用 Slot 分发内容</p>
<ul>
<li>使用特殊的<slot>元素作为原始内容的插槽（类似Angular的transclusion）</slot></li>
<li>父组件的内容将被抛弃，除非子组件模板包含 <slot></slot></li>
<li>如果子组件模板只有一个没有特性的slot，父组件的整个内容将插到slot所在的地方并替换它</li>
<li><slot>元素可以用一个特殊特性name配置如何分发内容</slot></li>
</ul>
</li>
</ul>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><p><a href="http://cn.vuejs.org/guide/components.html#使用-Slot-分发内容" target="_blank" rel="external">《Vue组件》</a></p>
<h2 id="创建头部菜单"><a href="#创建头部菜单" class="headerlink" title="创建头部菜单"></a>创建头部菜单</h2><hr>
<p>该头部菜单与前面的使用笔记中一致。如图：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/C902.tmp.png" alt="image"><br>由于Vue中木有找到类似React-Bootstrap一样的库，故这里先直接用bootstrap的样式css文件。</p>
<h3 id="添加头部组件"><a href="#添加头部组件" class="headerlink" title="添加头部组件"></a>添加头部组件</h3><ul>
<li>在components文件夹中添加Header.vue文件</li>
<li>添加模板</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div></pre></td><td class="code"><pre><div class="line">&lt;template&gt;</div><div class="line">&lt;nav class=&quot;navbar navbar-default header&quot;&gt;</div><div class="line">  &lt;div class=&quot;container-fluid&quot;&gt;</div><div class="line">    &lt;div class=&quot;navbar-header&quot;&gt;</div><div class="line">      &lt;a class=&quot;navbar-brand&quot;&gt;Godbasin&lt;/a&gt;</div><div class="line">    &lt;/div&gt;</div><div class="line">    &lt;div class=&quot;collapse navbar-collapse&quot; id=&quot;bs-example-navbar-collapse-1&quot;&gt;</div><div class="line">      &lt;ul class=&quot;nav navbar-nav&quot;&gt;     	</div><div class="line">        &lt;li v-for=&quot;menu in menus&quot; v-bind:class=&quot;current === menu.title ? &apos;active&apos; : &apos;&apos;&quot;&gt;</div><div class="line">        	&lt;a href=&quot;&#123;&#123; menu.href &#125;&#125;&quot;&gt;&#123;&#123; menu.text &#125;&#125;&lt;span v-show=&quot;menu.current&quot; class=&quot;sr-only&quot;&gt;(current)&lt;/span&gt;&lt;/a&gt;</div><div class="line">        &lt;/li&gt;</div><div class="line">      &lt;/ul&gt;</div><div class="line">      &lt;ul class=&quot;nav navbar-nav navbar-right&quot;&gt;</div><div class="line">      	&lt;li&gt;&lt;a&gt;&#123;&#123; clock &#125;&#125;&lt;/a&gt;&lt;/li&gt;</div><div class="line">        &lt;li class=&quot;dropdown&quot;&gt;</div><div class="line">          &lt;a class=&quot;dropdown-toggle&quot; data-toggle=&quot;dropdown&quot; role=&quot;button&quot; aria-haspopup=&quot;true&quot; aria-expanded=&quot;false&quot;&gt;菜单 &lt;span class=&quot;caret&quot;&gt;&lt;/span&gt;&lt;/a&gt;</div><div class="line">          &lt;ul class=&quot;dropdown-menu&quot;&gt;</div><div class="line">            &lt;li v-for=&quot;usermenu in usermenus&quot;&gt;&lt;a href=&quot;&#123;&#123; usermenu.href &#125;&#125;&quot;&gt;&#123;&#123; usermenu.text &#125;&#125;&lt;/a&gt;&lt;/li&gt;</div><div class="line">          &lt;/ul&gt;</div><div class="line">        &lt;/li&gt;</div><div class="line">      &lt;/ul&gt;</div><div class="line">    &lt;/div&gt;</div><div class="line">  &lt;/div&gt;</div><div class="line">&lt;/nav&gt;</div><div class="line">&lt;/template&gt;</div></pre></td></tr></table></figure>
<ul>
<li>添加逻辑</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div></pre></td><td class="code"><pre><div class="line">&lt;script&gt;</div><div class="line">export default &#123;</div><div class="line">  data () &#123;</div><div class="line">    return &#123;</div><div class="line">      menus: [&#123;</div><div class="line">        title: &apos;index&apos;, // title用于储存路由对应的路径</div><div class="line">        href: &apos;index.html#/index&apos;, // href用于设定该菜单跳转路由</div><div class="line">        text: &apos;首页&apos; // text用于储存该菜单显示名称</div><div class="line">      &#125;, &#123;</div><div class="line">        title: &apos;other&apos;,</div><div class="line">        href: &apos;index.html#/other&apos;,</div><div class="line">        text: &apos;其他&apos;</div><div class="line">      &#125;],</div><div class="line">      usermenus: [&#123;</div><div class="line">        text: &apos;退出&apos;, // text用于储存该菜单显示名称</div><div class="line">        href: &apos;index.html#/login&apos; // href用于设定该菜单跳转路由</div><div class="line">      &#125;],</div><div class="line">      clock: &apos;&apos; // clock用于储存时间</div><div class="line">    &#125;</div><div class="line">  &#125;,</div><div class="line">  props: [&apos;current&apos;], // current用于获取当前的位置</div><div class="line">  // 在created生命周期钩子上添加setInterval进行时钟的刷新，当然其他的生命周期钩子也可能适用</div><div class="line">  created: function () &#123;</div><div class="line">    var that = this</div><div class="line">    setInterval(function () &#123;</div><div class="line">      that.clockRender()</div><div class="line">    &#125;, 500)</div><div class="line">  &#125;,</div><div class="line">  // 在 `methods` 对象中定义方法</div><div class="line">  methods: &#123;</div><div class="line">    clockRender: function () &#123; // 刷新时钟</div><div class="line">      var numberStandard = function (num) &#123; // 格式化时间（小于10补上0）</div><div class="line">        var _val = Number(num)</div><div class="line">        var _num</div><div class="line">        _num = (_val &lt; 10) ? (&apos;0&apos; + _val) : (&apos;&apos; + _val)</div><div class="line">        return _num</div><div class="line">      &#125;</div><div class="line">      var _date = new Date() // 获取当前时间</div><div class="line">      this.clock = _date.getFullYear() + &apos;年&apos; + (_date.getMonth() + 1) + &apos;月&apos; +</div><div class="line">        _date.getDate() + &apos;日&apos; + &apos; &apos; + numberStandard(_date.getHours()) + &apos;:&apos; + numberStandard(_date.getMinutes()) +</div><div class="line">        &apos;:&apos; + numberStandard(_date.getSeconds())</div><div class="line">    &#125;</div><div class="line">  &#125;</div><div class="line">&#125;</div><div class="line">&lt;/script&gt;</div></pre></td></tr></table></figure>
<ul>
<li>添加样式（此处省略）<ul>
<li>使用<code>&lt;style&gt;</code>添加全局样式</li>
<li>可使用<code>&lt;style scoped&gt;</code>添加局部样式</li>
</ul>
</li>
</ul>
<h3 id="添加属性Props"><a href="#添加属性Props" class="headerlink" title="添加属性Props"></a>添加属性Props</h3><p>由于菜单的内容不变，我们可以将其写成Props属性。<br><figure class="highlight jsx"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div></pre></td><td class="code"><pre><div class="line">propTypes: &#123; <span class="comment">//属性校验器</span></div><div class="line">    menus: React.PropTypes.array, <span class="comment">//表示menus属性必须是array，否则报错</span></div><div class="line">    usermenus: React.PropTypes.array, <span class="comment">//表示usermenus属性必须是array，否则报错</span></div><div class="line">&#125;,</div><div class="line"><span class="attr">getDefaultProps</span>: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</div><div class="line">  <span class="keyword">return</span> &#123; <span class="comment">//设置默认属性</span></div><div class="line">    menus: [&#123;</div><div class="line">      <span class="attr">title</span>: <span class="string">'index'</span>, <span class="comment">//title用于储存路由对应的路径</span></div><div class="line">      href: <span class="string">'/index'</span>, <span class="comment">//href用于设定该菜单跳转路由</span></div><div class="line">      text: <span class="string">'首页'</span>, <span class="comment">//text用于储存该菜单显示名称</span></div><div class="line">    &#125;, &#123;</div><div class="line">      <span class="attr">title</span>: <span class="string">'others'</span>,</div><div class="line">      <span class="attr">href</span>: <span class="string">'/other'</span>,</div><div class="line">      <span class="attr">text</span>: <span class="string">'其他'</span>,</div><div class="line">    &#125;],</div><div class="line">    <span class="comment">//usermenus用于储存侧边下拉菜单</span></div><div class="line">    usermenus: [&#123;</div><div class="line">      <span class="attr">click</span>: <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;&#125;, <span class="comment">//click用于设置该菜单点击事件</span></div><div class="line">      text: <span class="string">'退出'</span>, <span class="comment">//text用于储存该菜单显示名称</span></div><div class="line">    &#125;],</div><div class="line">  &#125;;</div><div class="line">&#125;,</div></pre></td></tr></table></figure></p>
<h3 id="添加state状态"><a href="#添加state状态" class="headerlink" title="添加state状态"></a>添加state状态</h3><p>像时间这种每500毫秒刷新一次的，我们将其放在state中。<br><figure class="highlight jsx"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line">getInitialState: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</div><div class="line">  <span class="keyword">return</span> &#123;<span class="attr">clock</span>: <span class="string">''</span>&#125;; <span class="comment">//设置初始state值</span></div><div class="line">&#125;,</div><div class="line"><span class="comment">//定义clockRender事件，用于改变this.state.clock值</span></div><div class="line">clockRender: <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">  <span class="keyword">let</span> numberStandard = <span class="function"><span class="keyword">function</span>(<span class="params">num</span>) </span>&#123;</div><div class="line">    <span class="keyword">let</span> _val = <span class="built_in">Number</span>(num), _num;</div><div class="line">    _num = (_val &lt; <span class="number">10</span>) ? (<span class="string">'0'</span> + _val) : (<span class="string">''</span> + _val);</div><div class="line">    <span class="keyword">return</span> _num;</div><div class="line">  &#125;, _date = <span class="keyword">new</span> <span class="built_in">Date</span>(),</div><div class="line">    clock = _date.getFullYear() + <span class="string">'年'</span> + (_date.getMonth() + <span class="number">1</span>) + <span class="string">'月'</span> +</div><div class="line">      _date.getDate() + <span class="string">'日'</span> + <span class="string">' '</span> + numberStandard(_date.getHours()) + <span class="string">':'</span> + numberStandard(_date.getMinutes()) +</div><div class="line">      <span class="string">':'</span> + numberStandard(_date.getSeconds());</div><div class="line">  <span class="keyword">this</span>.setState(&#123;<span class="attr">clock</span>: clock&#125;);</div><div class="line">&#125;,</div></pre></td></tr></table></figure></p>
<p>注意：state不应存储计算后的值，计算应该在render中进行，但由于比较长，本骚年也就这样将就用了。小伙伴们有更好的方法也可以提出来哦。</p>
<h3 id="setInterval时钟"><a href="#setInterval时钟" class="headerlink" title="setInterval时钟"></a>setInterval时钟</h3><p>在componentDidMount中进行setInterval时钟。componentDidMount属于react生命周期，在初始化渲染执行之后立刻调用一次，仅客户端有效。<br>render就是一个模板的作用，他只处理和展示相关的逻辑，如果有业务逻辑，应放在componentWillMount和componentDidMount中执行。<br><figure class="highlight jsx"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="comment">//进行setInterval时钟</span></div><div class="line">componentDidMount: <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">  <span class="keyword">let</span> that = <span class="keyword">this</span>;			</div><div class="line">  <span class="keyword">this</span>.interval = setInterval(<span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    that.clockRender();</div><div class="line">  &#125;, <span class="number">500</span>);</div><div class="line">&#125;,</div><div class="line"><span class="comment">//组件注销时需销毁定时器</span></div><div class="line">componentWillUnmount: <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">  clearInterval(<span class="keyword">this</span>.interval);</div><div class="line">&#125;,</div></pre></td></tr></table></figure></p>
<h3 id="设置render模板"><a href="#设置render模板" class="headerlink" title="设置render模板"></a>设置render模板</h3><p>在这里大家可以看到react-bootstrap的使用方法啦。当然每个组件都是已经在该文件中引入了的。<br>还有jsx的遍历方法也会在这里展示。</p>
<ul>
<li>在index.jsx页面引入Header时添加属性active=”index”，作为菜单选中样式的判断<figure class="highlight jsx"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div></pre></td><td class="code"><pre><div class="line">render() &#123;</div><div class="line">  <span class="keyword">return</span> (</div><div class="line">    <span class="keyword">let</span> active = <span class="keyword">this</span>.props.active; <span class="comment">//获取父组件传递的props</span></div><div class="line">    &lt;Navbar className=<span class="string">"header"</span> fluid&gt;</div><div class="line">      &lt;Navbar.Header className="navbar-header"&gt;</div><div class="line">        &lt;Navbar.Brand&gt;Godbasin&lt;/Navbar.Brand&gt;</div><div class="line">      &lt;/Navbar.Header&gt;</div><div class="line">      &lt;Navbar.Collapse id="bs-example-navbar-collapse-1"&gt;</div><div class="line">        &lt;Nav navbar&gt;     	</div><div class="line">        &#123; //遍历头部菜单menus</div><div class="line">          this.props.menus.map(function(menu, i) &#123;</div><div class="line">            //判断，若title等于active，则加载选中样式</div><div class="line">            return (&lt;li key=&#123;i&#125; className=&#123; menu.title == active ? "active" : ""&#125;&gt;&lt;a href=&#123;menu.href&#125;&gt;&#123; menu.text &#125;&lt;span className="sr-only"&gt;(current)&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;);</div><div class="line">          &#125;)</div><div class="line">        &#125;</div><div class="line">        &lt;/Nav&gt;</div><div class="line">        &lt;Nav navbar pullRight&gt;</div><div class="line">          &lt;li&gt;&lt;a&gt;&#123; this.state.clock &#125;&lt;/a&gt;&lt;/li&gt;</div><div class="line">          &lt;NavDropdown title="菜单" id="top-aside-menu"&gt;</div><div class="line">            &#123; //遍历右侧下拉菜单usermenus</div><div class="line">              this.props.usermenus.map(function(usermenu,i) &#123;</div><div class="line">                return (&lt;MenuItem key=&#123;i&#125;&gt;&#123; usermenu.text &#125;&lt;/MenuItem&gt;);</div><div class="line">              &#125;)</div><div class="line">            &#125;</div><div class="line">          &lt;/NavDropdown&gt;</div><div class="line">        &lt;/Nav&gt;</div><div class="line">      &lt;/Navbar.Collapse&gt;</div><div class="line">    &lt;/Navbar&gt;</div><div class="line">  )</div><div class="line">&#125;</div></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="Index组件中添加Header"><a href="#Index组件中添加Header" class="headerlink" title="Index组件中添加Header"></a>Index组件中添加Header</h3><p>在components文件夹中打开Index.vue文件</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line">&lt;template&gt;</div><div class="line">  &lt;!--使用is绑定组件，current传入prop数据--&gt;</div><div class="line">  &lt;div is=&quot;my-header&quot; current=&quot;index&quot;&gt;&lt;/div&gt;</div><div class="line">  &lt;div class=&quot;container&quot;&gt;Hello Vue!&lt;/div&gt;</div><div class="line">&lt;/template&gt;</div><div class="line">&lt;script&gt;</div><div class="line">//导入Header组件</div><div class="line">import MyHeader from &apos;./Header.vue&apos;</div><div class="line">export default &#123;</div><div class="line">  components: &#123;</div><div class="line">    MyHeader</div><div class="line">  &#125;</div><div class="line">&#125;</div><div class="line">&lt;/script&gt;</div></pre></td></tr></table></figure>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>Vue还是挺好用的呢，文档也写得很全很详细，虽然相应的插件、库等还是比较少，但不得不说从Angular重构还是挺多可以复用的代码呢。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/vue-notes/3-create-header" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://vue-notes.godbasin.com/3-create-header/index.html?#!/index" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">
			查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a>
			<br>
			更欢迎来<a href="https://godbasin.github.io/front-end-playground">被删的前端游乐场</a>边撸猫边学前端噢
		</p>
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	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Vue组件"><span class="toc-number">1.</span> <span class="toc-text">Vue组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Vue实例"><span class="toc-number">1.1.</span> <span class="toc-text">Vue实例</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实例生命周期"><span class="toc-number">1.2.</span> <span class="toc-text">实例生命周期</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Vue组件-1"><span class="toc-number">1.3.</span> <span class="toc-text">Vue组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#父子组件通信"><span class="toc-number">1.4.</span> <span class="toc-text">父子组件通信</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">1.5.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#创建头部菜单"><span class="toc-number">2.</span> <span class="toc-text">创建头部菜单</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#添加头部组件"><span class="toc-number">2.1.</span> <span class="toc-text">添加头部组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加属性Props"><span class="toc-number">2.2.</span> <span class="toc-text">添加属性Props</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加state状态"><span class="toc-number">2.3.</span> <span class="toc-text">添加state状态</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#setInterval时钟"><span class="toc-number">2.4.</span> <span class="toc-text">setInterval时钟</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#设置render模板"><span class="toc-number">2.5.</span> <span class="toc-text">设置render模板</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Index组件中添加Header"><span class="toc-number">2.6.</span> <span class="toc-text">Index组件中添加Header</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
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